From the ebooks@cambridge website:
ebooks@cambridge is an initiative of Cambridge College Libraries that provides access to electronic versions of hundreds of the books most used by undergraduate students. They are available to all current staff and students of the University from any location at any time.
The ebooks provide online versions of complete texts, allowing readers to search, print and download sections of works (subject to the usual copyright restrictions). Additionally, they offer features such as dictionary checking and citation export; electronic notes and bookmarks can be made by creating a personal account. The number of simultaneous logins and functions available for each book vary according to the provider and the format in which the text has been provided by the publisher. Our collection covers all Tripos subjects.
All ebooks are accessible via the UL electronic resources – ebooks web page.